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Title

Identification and localization of a caleosin in olive (Olea europaea L.) pollen during in vitro germination

AuthorsZienkiewicz, Krzysztof; Castro López, Antonio Jesús; Alché Ramírez, Juan de Dios; Zienkiewicz, Agnieszka; Suárez, Cynthia; Rodríguez García, María I.
KeywordsCaleosin
In vitro germination
Oil bodies
Olea europaea
Olive pollen grain
Pollen tube
Issue Date2010
PublisherOxford University Press
CitationJournal of Experimental Botany 61(5): 1537-1546 (2010)
AbstractIn plant organs and tissues, the neutral storage lipids are confined to discrete spherical organelles called oil bodies. Oil bodies from plant seeds contain 0.6–3% proteins, including oleosins, steroleosins, and caleosins. In this study, a caleosin isoform of ∼30 kDa was identified in the olive pollen grain. The protein was mainly located at the boundaries of the oil bodies in the cytoplasm of the pollen grain and the pollen tube. In addition, caleosins were also visualized in the cytoplasm at the subapical zone, as well as in the tonoplast of vacuoles present in the pollen tube cytoplasm. The cellular behaviour of lipid bodies in the olive pollen was also monitored during in vitro germination. The number of oil bodies decreased 20-fold in the pollen grain during germination, whereas the opposite tendency occurred in the pollen tube, suggesting that oil bodies moved from one to the other. The data suggest that this pollen caleosin might have a role in the mobilization of oil bodies as well as in the reorganization of membrane compartments during pollen in vitro germination.
Description10 páginas, 7 figuras, 1 tabla.
Publisher version (URL)http://dx.doi.org/10.1093/jxb/erq022
URIhttp://hdl.handle.net/10261/32769
DOI10.1093/jxb/erq022
ISSN0022-0957
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